Prompt Assessment of Global Earthquakes for Response Data for - PowerPoint PPT Presentation

Prompt Assessment of Global Earthquakes for Response Data for Reinforced Concrete Building Type in India (C3)

Nonlinear Static Pushover Analysis • An internal frame of a four storey RC building • A four storey RC building Different Models Analyzed considering Different Configuration of Masonry Infill Walls (based on prevalent design methodology) • Bare Frame Model (without considering strength and stiffness of infill walls in any storey) • Fully Infilled Model (Considering infills in all the stories) • Open First Storey Model (Considering infills in all but first storey) Analysis carried out in SAP2000

Nonlinear Static Analysis:: Plastic Hinge properties RC Elements PM M θ V Δ Masonry Elements

Building Frame Considered: Seismic zone IV, Medium Soil, 14 m high, LL: 2.0 kN/m2 at floors, 0.75 kN/m2 at roof Elevation and designed RC sections Plan

Bare Frame (including only weight of infills) Inelastic response Failure Pushover Curve and Location of Plastic Hinges - Flexural Failure of the Frame - Damage well distributed along height

Bare Frame (including only weight of infills)

Bare Frame (including only weight of infills)

Open First Storey Frame Inelastic response Failure Pushover Curve and Location of Plastic Hinges - No masonry infills in the first storey - Lateral deformations accumulate at first storey - Collapse due to shear failure of first storey columns and beams

Open First Storey Frame

Open First Storey Frame

Fully-Infilled Frame Inelastic response Failure Pushover Curve and Location of Plastic Hinges - Masonry infills in all the stories; I storey infills fail very early - Abrupt reduction in lateral strength after failure of infills in I storey - Very stiff structure, lateral deformations uniformly distributed along height - Collapse due to shear failure of first storey columns and beams

Fully-Infilled Frame (1:0:3)

Fully-Infilled Frame (1:0:3)

Building Considered: Seismic zone V, Foundation on Rock 30.3 m Long and 9.4 m wide

Open First Storey Building Pushover Curve - No masonry infills in the first storey - Lateral deformations accumulate at first storey - Analysis could not be completed after failure of a few first storey columns and beams

Open First Storey Building

Open First Storey Building

Fully Infilled Building Pushover Curve - Masonry infills in all the stories; I storey infills fail very early - Abrupt reduction in lateral strength after failure of infills in I storey - Very stiff structure, lateral deformations uniformly distributed along height - Analysis could not be completed after failure of I storey infills

Fully Infilled Building

Fully Infilled Building

• Results based on analytical simulations of typical RC buildings constructed in India. • Strength and stiffness of masonry infill walls was not considered while designing the structure ; only weight was considered (Prevalent design philosophy in India). • In nonlinear analyses, compressive strut action was assumed in the masonry infills. • Soil – Structure interaction was not considered. Buildings were assumed to be fixed at the bottom of foundation. • Nonlinearity in RC slabs and Staircase was not considered. Therefore, behaviour and performance of actual buildings may differ from these analytical results.